KR101931631B1 - Apparatus and method for encoding a image in camera device - Google Patents

Abstract

A compression ratio determination unit for extracting an auto focus filter value of an image obtained from a camera and determining a compression ratio adjustment value according to image complexity, a processing unit for image-processing an image obtained from the camera line by line, And a still image codec for compressing the line image output from the processing unit according to a compression rate adjustment value.

Description

[0001] APPARATUS AND METHOD FOR ENCODING IMAGE IN CAMERA DEVICE [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for encoding an image of a camera apparatus, and more particularly, to an apparatus and method for adjusting a compression ratio by analyzing an image size.

Generally, a method of compressing an image in a camera device transmits image data obtained by an image sensor of a camera to an image processing unit, and the image processing unit uses a compression encoding method using an internal encoder. At this time, if the image obtained from the image sensor of the camera is a complex image, the image processing unit increases the compression ratio to reduce the overall capacity of the image, and if the image is a simple image, the image quality is improved by lowering the compression ratio.

Generally, the image processing unit of the camera apparatus uses a method of buffering and processing image data on a frame basis. In this case, the image processing unit analyzes the image data received from the camera in units of frames to adjust the compression rate, and analyzes the image complexity on a frame basis to adjust the compression coding rate. However, when the image processing unit uses a line buffer type that processes image data for each line without using a frame buffer, the image processing unit determines the compression rate in advance because it can not know the complexity of the image in advance . Therefore, when a line buffer (not a frame buffer) type is used in a camera apparatus, the image processing unit can not control the compression rate in advance and if the size of the image is large enough to exceed a predetermined transmission speed, An error may occur.

The present invention relates to an apparatus and method for efficiently compressing and encoding an image by analyzing the complexity of image data obtained even when a line buffer type image processing unit for processing an image obtained from a camera in a camera unit in a line unit is used I suggest. To this end, the image processing unit according to an embodiment of the present invention proposes an apparatus and method for estimating the size of an image from an automatic focus result value at the time of acquiring an image from a camera, and adjusting the compression rate using the image size.

The image processing apparatus of a camera according to an embodiment of the present invention sets a portion of an image obtained from a camera as a window for measuring the complexity of an image and filters pixels in the window to extract an auto- A compression ratio determination unit for determining a compression ratio adjustment value in accordance with the complexity of the image; an image processing unit for processing the image obtained from the camera in units of lines and determining the complexity using the outline data of the image obtained in the process of extracting the auto- And a still image codec for compressing the line image output from the image processing unit according to the compression ratio adjustment value, wherein the compression ratio determination unit includes a plurality of factors for determining a compression ratio adjustment value of the image obtained from the camera and a table for storing a factor, By comparing the auto-focus filter value and the preset reference value is a factor corresponding to the image complexity, characterized in that to determine in said table.

Also, the image processing method of the camera device according to the embodiment of the present invention sets a part of an image obtained from a camera as a window for measuring the complexity of an image, filters pixels in the window, extracts an auto- Determining a compression ratio adjustment value according to the image complexity; processing the image obtained from the camera in units of lines using an image processing unit, using the outline data of the image obtained in the process of extracting the auto focus filter value, Wherein the step of determining the compression ratio adjustment value is performed by a compression ratio determination unit, and the compression ratio determination unit determines the compression ratio of the image, Adjust the compression ratio adjustment value of the image obtained from the camera Comprising: a table for storing the plurality of factors (factor) for, characterized in that by comparing the extracted autofocus filter value with a preset reference value to determine a factor corresponding to the image complexity in the table.

According to another aspect of the present invention, there is provided a camera apparatus including a camera for acquiring an image, a camera for setting a part of the image obtained from the camera as a window for measuring the complexity of the image, And a compression ratio determination unit for determining a compression ratio adjustment value according to image complexity by extracting a value of the auto-focus filter value from the camera, and compressing the line image obtained from the camera according to the display image and the compression ratio adjustment value, An image processing unit for determining the complexity using the outline data of the image obtained in the process of extracting the compressed image, Which controls to store A display unit for displaying a display image in a frame unit output from the application processing unit, and a storage unit for storing a compressed image in units of frames output from the application processing unit, wherein the compression ratio determination unit determines an image obtained from the camera And a table for storing a plurality of factors for determining a compression ratio adjustment value of the auto focus filter, wherein the extracted auto focus filter value is compared with a preset reference value, and a factor corresponding to the image complexity is confirmed in the table .

A camera apparatus having an image processing unit for processing an image in units of lines adjusts a compression ratio of a line image by using an auto focus function. For this purpose, the image processing unit in the camera apparatus estimates the size of the image from the auto focus result value when acquiring an image from the camera, and adjusts the compression ratio using the image size, thereby efficiently compressing and encoding the image.

1 is a diagram showing a configuration of a portable terminal device having a camera device or a camera according to an embodiment of the present invention
Fig. 2 is a diagram showing the configuration of the image processing unit of Fig. 1
3 is a diagram showing the configuration of the compression ratio determining unit of Fig. 2
FIG. 4A is a diagram illustrating an example of window setting for determining a compression ratio according to an embodiment of the present invention, and FIG. 4B is a diagram illustrating an example of Q table adjustment according to a filter value extracted in a set window region
5 is a flowchart illustrating a procedure for adjusting the compression ratio of an image in a camera apparatus according to an embodiment of the present invention.
6 is a view showing another configuration example of the camera device according to the embodiment of the present invention

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the same configurations of the drawings denote the same reference numerals as possible whenever possible.

In the following description, specific details such as an autofocus filter value and the like are provided. However, it should be understood that the present invention is not limited to the above-described embodiments. It will be self-evident to those who have knowledge. In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In the camera device having the image processing unit for processing the line image, the image processing unit determines the complexity of the image using the edge data of the image obtained in the auto focus process, The compression ratio of the image data is adjusted. Here, the line image may be a line image or a plurality of line images. That is, the term line image processed by the image processing unit of the present invention may be a one line image or two or more plural line images.

In the term described in the embodiment of the present invention, the processing unit will be used as a term including a preprocessing unit and a post-processing unit, and a preview mode and a movie recording mode are modes in which a moving image is displayed on a display unit, And the still image is captured and stored. Further, in the embodiment of the present invention, it will be described on the assumption that the compression ratio determining unit for determining the compression ratio of the still image is configured in the preprocessing unit. However, the compression ratio determination unit may be configured independently in the image processing unit.

The image processing unit according to the embodiment of the present invention extracts the AF Filter Value when auto focusing the image obtained by the image sensor of the camera and determines the extracted AF Filter Value to use as the default Q factor necessary for image compression Determine if it is a simple image or not. If it is determined that the image is a simple image that can use the default Q factor in the AF Filter Value, the JPEG processor performs JPEG compression with the existing basic compression ratio. If the image is judged to be a complex image in the AF Filter Value, And compresses and compresses the image.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a diagram showing a configuration of a portable terminal device having a camera device or a camera according to an embodiment of the present invention; FIG. In the following description, the camera device will be used in the term including a portable terminal device having a camera.

Referring to FIG. 1, the camera 110 includes an image sensor, and acquires an image through an image sensor when the camera is driven. The camera 110 includes an optical unit, an image sensor, and a signal processing unit. The optical unit is driven by a mecha-shutter, a motor, and an actuator, and performs operations such as zooming and focusing by the actuator. The optical unit captures an image of a surrounding area, and the image sensor senses an image captured by the optical unit and converts the sensed image into an electrical signal. The image sensor may be a CMOS or a CCD sensor, and may be a high-resolution image sensor. The camera's image sensor may also incorporate a global shutter. The Global shutter performs a similar function to the mechanical shutter incorporated in the sensor.

 In the embodiment of the present invention, the image sensor may be a sensor capable of detecting an image of UHD (Ultra High Definition) or higher. An image sensed by the image sensor is converted into a digital image through a signal processing unit and output. The output data from the camera 110 may be Bayer data (raw data).

An image processing unit (ISP) 120 inputs an image obtained by the camera 110 on a line-by-line basis, and processes the line-by-line image to generate a display image and a compression-coded image. At this time, the image processor 120 extracts the AF Filter Value of the image obtained from the camera 110 when the camera 110 is controlled by Auto Focusin (AF), and analyzes the AF Filter Value to determine whether the acquired image has a default Q factor If it is determined that the image is a simple image that can be used, the received line images are compressed and coded based on the basic compression ratio. If it is determined that the image is a complicated image, the Q factor is adjusted to compress the line images. The image processing unit 120 multiplexes the image-processed display image and a compression-encoded image (hereinafter referred to as a compressed image) in units of lines and outputs the multiplexed image. At this time, the image processing unit 120 outputs header information for identifying a display image and a compressed image to a display image and a compressed image on a line basis, respectively.

An application processor (AP) 130 demultiplexes and / or parses the display image and the compressed image in the line unit multiplexed by the image processing unit 120 and buffers the display image and the compressed image in units of frames, . In this case, the application processor 130 may include a frame buffer for storing a compressed image in units of frames. In this case, the frame buffer for storing the compressed image may be set to a size capable of storing 2-5 frame images. Here, the reason why the compressed image is buffered by 2 to 5 frames is to implement zero shutter rake. Generally, the camera apparatus can not capture an image confirmed by the viewfinder or the display unit 130 due to shutter delay at the time of shutter-on, and obtains a predetermined frame-delayed image. That is, a shutter delay, a shutter lag, and a time lag are generated in the camera device from when the shutter button is pressed to when the user turns on the shutter, until the shutter of the actual camera device operates. Such a time delay may vary depending on the camera apparatus, and the control unit 100 must experimentally determine the delay time by measuring it. In the embodiment of the present invention, a zero shutter cycle is implemented by selecting and processing a corresponding frame image from the buffered frame images in consideration of the delay time when the shutter-ON is detected. For example, assuming that the shutter delay (shutter delay) is two frames, the frame buffer storing the compressed image may be configured as a ring buffer capable of storing three frames of images. In this case, the frame buffer for buffering the compressed image in the preview mode is overwritten so as to keep the high resolution frame images generated in each frame period for the set number of frames. In the preview mode, when the shutter is on (i.e., when a captured image is requested), the application processing unit 130 reads the compressed image considering the shutter delay time in the compressed image frame buffer and stores the read compressed image in the storage unit 140.

The storage unit 140 is a memory for storing images photographed by the camera device. In the embodiment of the present invention, motion images can be stored as well as storing still images. The display unit 150 may be a display device such as an LCD or an LED, and displays images taken by the camera device and information during shooting. The input unit 160 may include buttons for generating commands for performing setting and operation of each function of the camera apparatus. Here, the button of the input unit 160 may be set as a button on the outside of the camera device, and some buttons may be configured as a touch panel. In this case, some buttons of the display unit 150 and the input unit 160 may be configured as a touch screen.

2 is a diagram showing a configuration of the image processing unit of FIG.

Referring to FIG. 2, the preprocessing unit 210 preprocesses a line image obtained from the camera 110. The preprocessing function may include 3A (auto white balance), AE (auto exposure), AF (auto focusing) extraction and processing, lens shading correction, dead pixel correction, And the like. The preprocessing unit 210 extracts an AF Filter Value of an image obtained from the camera 110 at the time of AF and sets a Q factor for performing compression encoding of the obtained image by analyzing the AF Filter Value. Respectively.

The post-processing unit 230 performs post-processing of the preprocessed line images. The post-processing unit 230 may include a color interpolator, an image processing chain (IPC), and an image converter. First, the color interpolator performs a color interpolation function for converting the image (Bayer data) output from the camera 110 into a color image. As described above, the image sensor of the camera 110 may be a CCD or a CMOS image sensor. At this time, the CCD / CMOS image sensor uses a color filter array, so that each pixel sensor has only one channel among three color channels for producing a color image. The color interpolation performs a function of converting an image output from the camera 110 into a color including RGB of three colors (full color conversion). The color interpolator performs a color interpolation function using the correlation between adjacent pixels. Generally, image processing before color interpolation is called preprocessing in the image processing apparatus, and image processing after color interpolation is called after-processing. Secondly, the IPC performs noise reduction, gamma correction, luminance correction, and the like of the color interpolated images. Thirdly, the color conversion unit converts the post-processed image into a YUV image. That is, the post-processing unit 230 performs color interpolation, post-processing, and then converts the image into a YUV image.

The still image codec 230 receives the post-processed line images and compresses and encodes the received line images according to a Q factor determined by the compression ratio determination unit 215 of the preprocessing unit 210. Herein, the still image codec 230 encodes the received line images with the line image compression ratio set by the Q factor output from the compression ratio determination unit 215, and also outputs the adjusted Q table when the compression ratio adjustment is performed.

The multiplexer 240 multiplexes the post-processed display image (i.e., YUV image) and the compressed image output from the still image codec 230, and outputs the multiplexed image to the application processor 130. At this time, when multiplexing the display image and the compressed image, the multiplexer 240 may multiplex the display image and the compressed image by adding header information for identifying the display image and the compressed image. The multiplexed line image is converted into serial data and transmitted to the application processor 130.

3 is a diagram showing the configuration of the compression ratio determination unit 215 of FIG.

Referring to FIG. 3, a Y generator 310 generates luminance data (Y data, luminance data) using R, G, and B data output from the camera 110. The reason for generating the luminance data is to detect the edge component of the image to determine the complexity of the image. The filter 320 AF filters the luminance data (or luminance data and G data) output from the luminance generator 310 to obtain an auto-focusing filter value. The filter 420 may filter the G data of the image generated by the camera 100 to obtain an AF filter value. In this case, the brightness generating unit (Y generating unit) 310 may be omitted. Further, the filter 420 may filter the data (Y data and / or G data) of the window region set in the frame image section. In this case, the set window may be a full frame image or images of a specific region (region) of the frame image region. Here, the specific region (region) may be a specific line image of the frame image (at least one line image) or a specific region of the frame region. . The filter 320 may be a FIR filter (Finite Impulse Response filter) and / or an IIR filter (Infinite Impulse Response filter). That is, the filter 320 filters low-frequency components and / or high-frequency components during the AF filter to remove noise and generates an auto-focusing filter value for detecting an edge component of an image. Where the filter 320 can AF filter all line images, or AF filter the images of the set area or line. The AF sum value 330 adds the AF filter values of the pixels output from the filter 320. The Q table 350 stores Q factors that determine the image compression ratio according to the image complexity. Here, the Q table may have a plurality of Q factors for adjusting a default Q factor and a compression ratio. The determination unit 340 compares and analyzes the AF added value output from the addition unit 330 with a predetermined reference value, determines a Q factor corresponding to the complexity of the image in the Q table according to the analysis result, and outputs the Q factor to the still image codec 230 do.

FIGS. 4A and 4B are views for explaining the operation of the compression ratio determining unit 215 having the configuration shown in FIG. FIG. 4A is a diagram illustrating an example of a window setting for determining a compression ratio according to an embodiment of the present invention, and FIG. 4B is a diagram illustrating an example of a filter value extracted from a set window area.

Referring to FIGS. 4A and 4B, the compression ratio determination unit 215 sets the entire area or a partial area of the frame image size as a window for measuring the complexity of an image, and filters pixels in the set window. In this case, the method of setting the window may be the entire image of the frame (i.e., the entire image of the frame obtained in the camera 110), or may set some intervals within the frame image area, such as 410 or 420 in FIG. One or more line image areas may be set as shown in 430. [

First, the Y generator 310 generates Y data using line-by-line images acquired by the camera 100. [ Then, the filter 320 filters the image (the Y data and / or the G data of the image output from the camera 110) at the time of automatic focus adjustment, and if the line image is an image in a window set as shown in FIG. 4A, And extracts the AF filter value. At this time, the AF filter value extracted from the filter 320 may have a value as shown in FIG. 4B. The adder 330 adds the AF filter value as shown in FIG. 4B. The determining unit 340 compares the added AF filter value with the set reference value to determine whether the image is complex or not. The Q factor according to the determined result is Q table and applies the same to the still picture codec 230.

That is, the compression ratio determination unit 215 extracts an auto focus filter value in a window set through the filter 320 when autofocusing an image obtained by the image sensor of the camera, adds the same to the addition unit 330, The AF filter value is analyzed to determine the Q factor required for image compression. In this case, the compression ratio determination unit 215 determines a compression ratio to perform JPEG compression with a basic compression ratio if the image is judged as a simple image that can use a default Q factor at the auto-focus filter value. If the compression ratio is determined to be a complex image, Adjust the factor to adjust the compression rate.

5 is a flowchart showing a procedure for adjusting the compression ratio of an image in a camera apparatus according to an embodiment of the present invention.

Referring to FIGS. 1 to 4 and the flowchart of FIG. 5, when the user generates a camera driving command through the input unit 160 in the camera apparatus according to the embodiment of the present invention, And the application processing unit 130 controls the image processing unit 120 to drive the camera 110. At this time, the camera 110 acquires an image in step 513, and the obtained image may be a full-resolution Bayer image. In step 513, the image processor 120 processes the image obtained by the camera 110, and the frame rate of the image may have a frame rate of 30 fps (frame per second) or more (for example, 60 fps).

The preprocessing unit 210 of the image processing unit 120 receiving the image as described above preprocesses the image output from the camera 110 in units of lines, and the preprocessing process includes 3A (auto white balance), auto exposure (AE) focusing, etc.) and extracting and processing lens shading compensation, dead pixels, and knee correction. The preprocessed image is applied to the post-processing unit 220.

In addition, the preprocessing unit 210 analyzes the complexity of the image obtained in the course of performing autofocusing to determine the compression ratio of the image. That is, the image processing unit 120 determines the compression ratio of the image to be compression-encoded in units of lines through the compression ratio determination unit 215. [ In step 515, the image processor 120 filters (FIR and / or IIR filtering) the luminance data in the window as shown in FIG. 5A in step 515, extracts the AF filter value as shown in FIG. 5B, Is added. Then, the added AF filter value is analyzed and it is determined in step 517 whether the default Q factor can be encoded. If the default Q factor can be coded, the image processor 120 sets a default Q factor in step 519. If the default Q factor is not available, the image processor 120 determines Q (k) corresponding to the AF filter value in step 521 factor. In step 523, the image processor 120 applies the Q factor set as described above to the still image codec 230, and the still image codec 230 compresses and encodes the line image input by the applied Q factor.

In the process of processing the image with the compression rate set as described above, the line image to be preprocessed in the preprocessing unit 210 is applied to the post-processing unit 220. Then, the post-processing unit 220 receives the preprocessed line images and performs a post-processing operation such as color interpolation, noise reduction, gamma correction, and color conversion on the line image. That is, the color interpolation operation is performed to generate each pixel data as data including RGB components, to correct noise of each color interpolated pixel data, and then convert the noise into YUV data.

The still picture codec 230 compresses and encodes the line images output from the post-processing unit 220 at a predetermined compression coding rate, according to a Q factor determined by the procedure of FIG. The still image codec 230 may be a still image encoder and a JPEG encoder. In the embodiment of the present invention, the still image is JPEG (Joint Photographic Expert Group). However, the still image may use another still encoding method (for example, TIFF (Tagged-Image File Format)) have.

At this time, the image output from the post-processing unit 220 may be a YUV image, a display image displayed on the display unit 150 in a preview mode or a movie recording mode, and the compressed image output from the still image codec 230 may be stored in a storage unit 230 as shown in FIG. The multiplexer 240 multiplexes the display image and the compressed image, and outputs the multiplexed image to the application processor 130. At this time, the multiplexer 240 outputs header information for identifying the display image and the compressed image to the display image and the compressed image on a line basis, respectively.

Then, the application processor 130 demultiplexes and / or parses the display image and the compressed image in the line unit multiplexed by the image processing unit 120, and buffers the display image and the compressed image in units of frames, and displays the frame display image on the display unit 150 And displays it. At this time, the display image may be a preview image. The application processor 130 includes a frame buffer for buffering a predetermined number of frame images. Accordingly, the application processing unit 130 buffers the line images compressed and transmitted by the image processing unit 120 in units of frames, and the number of frame images to be buffered at that time is the number of frames that can implement a zero shutter cycle. Therefore, the application processing unit 130 overwrites the compressed images transferred from the image processing unit 120 so that the compressed images can be maintained at the set frame number.

When a capture request is generated in the preview mode or the moving picture recording mode, the application processing unit 130 accesses the compressed image of the frame corresponding to the shutter-on time in the frame buffer to implement the zero shutter cycle, And stores the accessed image in the storage unit 140.

6 is a diagram showing another configuration example of the camera apparatus according to the embodiment of the present invention.

Referring to FIG. 6, in the camera device, the display image and the compressed image may have different image sizes. That is, the display image refers to an image displayed on the display unit 130 or an image stored during movie recording, and the compressed image refers to an image stored as a still image when a user requests capture. Accordingly, the still image may be a full resolution image of the camera 110 or an image obtained by compressing a YUV image having a smaller size. Therefore, in general, the image processing unit 120 of the camera device may have an image scaler for scaling an image obtained from the camera 110 for generating a display image to a small size as shown in FIG.

6, when a camera driving command is generated, the camera 110 acquires an image of a full resolution and applies the image to the preprocessing unit 610. FIG. The pre-processing unit 610 preprocesses the obtained image of the camera 110. At the same time, the compression ratio determination unit 615 as shown in FIG. 3 analyzes the complexity of the image by filtering the pixels in the set window, To the video codec 650. The preprocessing unit 610 preprocesses the input images in the line unit as described above. The preprocessing unit extracts and processes 3A (auto white balance (AWB), auto exposure (AE), and auto focusing Lens shading compensation, dead pixels, and knee correction.

Then, the image scaler 620 scales the preprocessed line-by-line image to a set image size, wherein the image is a full-resolution image of the camera 110, and the image scaling can be performed for displaying on the display unit 130. The image scaling may be implemented using one or more of various methods such as resize, decimation, interpolation, crop, addition, and averaging. The image scaler 620 reduces the number of pixels of the full resolution image obtained by the camera 110 and scales the image to an appropriate size to be displayed on the display unit 150 and scales the image to fit the aspect ratio of the display unit 150. Where the image scaling may be scaled at various ratios.

The scaled line-by-line image is post-processed in the post-processing unit 630. The post-processing can perform functions such as color interpolation, noise reduction, gamma correction, and color conversion.

In addition, the preprocessed full resolution image in line units is applied to the post-processing unit 640. Here, the post-processing unit 640 can perform the same operation as the post-processing unit 630, and the processed image size is different. That is, the post-processing unit 630 post-processes the image in the unit of the image-scaled line, and the post-processing unit 650 processes the full resolution image (or the image of the size set by the user) Then, the still image codec 650 compresses and encodes the image output from the post-processing unit 640 at the coding rate (compression rate) determined by the compression rate determination unit 615.

The multiplexer 660 multiplexes the display image and the compressed image, and outputs the multiplexed image to the application processor 130. At this time, the multiplexer 660 outputs header information for identifying the display image and the compressed image to the display image and the compressed image on a line basis, respectively.

The embodiments of the present invention disclosed in the present specification and drawings are merely illustrative of specific embodiments of the present invention and are not intended to limit the scope of the present invention in order to facilitate understanding of the present invention. It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.

Claims (14)

In an image processing apparatus of a camera,
A compression ratio determination unit configured to set a certain area as a window for measuring an image complexity in an image obtained from a camera and to filter pixels in the window to determine a compression ratio adjustment value according to image complexity by extracting an auto focus filter value,
An image processor for processing an image obtained from the camera in units of lines and determining complexity using outline data of the image obtained in the process of extracting the auto focus filter value;
And a still image codec for compressing the line image output from the image processing unit according to the compression rate adjustment value,
Wherein the compression ratio determination unit
And a table storing a plurality of factors for determining a compression ratio adjustment value of an image obtained from the camera, wherein the comparison unit compares the extracted auto-focus filter value with a preset reference value, and calculates a factor corresponding to the image complexity Is identified in the table. 2. The apparatus of claim 1, wherein the compression ratio determining unit
A filter for filtering luminance data or G data of an image obtained by the camera to generate an auto-focus filter value;
An adder for adding the auto-focus filter value,
And a determiner for analyzing the added filter value to determine a factor for adjusting a compression ratio according to image complexity. 3. The apparatus of claim 2, wherein the determination unit includes a table, and determines the factor by comparing and analyzing the added filter value with the table. The image processing apparatus according to claim 3, wherein the image processing unit
A preprocessing unit for correcting automatic exposure of an image obtained by the camera, focus, lens shading and dead pixels,
And a post-processing unit for performing color interpolation and color conversion on the preprocessed image. The image processing apparatus according to claim 3, wherein the image processing unit
A preprocessing unit for correcting automatic exposure of an image obtained by the camera, focus, lens shading and dead pixels,
An image scaler for scaling the preprocessed image to a size of a display unit,
A display image post-processor for performing color interpolation and color conversion on the scaled image;
And a compressed image post-processing unit for performing color interpolation and color conversion on the pre-processed image and transmitting the color-interpolated and color-converted image to the still image codec. In an image processing method of a camera,
Determining a compression ratio adjustment value according to image complexity by extracting an auto-focus filter value by filtering pixels in the window and setting a partial area of the image obtained from the camera as a window for measuring the complexity of the image;
Determining a complexity using the outline data of the image obtained in the process of extracting the auto focus filter value by processing an image obtained from the camera in units of lines using an image processing unit,
Compressing the image processed line image according to the compression ratio adjustment value,
The process of determining the compression ratio adjustment value is performed through a compression ratio determination unit,
Wherein the compression ratio determination unit
And a table storing a plurality of factors for determining a compression ratio adjustment value of an image obtained from the camera, wherein the comparison unit compares the extracted auto-focus filter value with a preset reference value, and calculates a factor corresponding to the image complexity Is identified in the table. 7. The method of claim 6, wherein the step of determining the compression ratio adjustment value comprises:
Generating an auto focus filter value by filtering luminance data or G data of an image output from the camera;
Adding the auto-focus filter value,
And analyzing the added filter value to determine a factor for adjusting the compression ratio according to the image complexity. The method of claim 7, wherein the determining of the factor comprises determining the factor by comparing the added filter value with the table. 9. The method according to claim 8,
A preprocessing step of correcting automatic exposure of an image obtained by the camera, focus, lens shading and dead pixels,
And post-processing a color interpolation and a color conversion of the preprocessed image. 9. The method according to claim 8,
A preprocessing step of correcting automatic exposure of an image obtained by the camera, focus, lens shading and dead pixels,
Scaling the preprocessed image to a size of a display unit;
A display image post-processing step of performing color interpolation and color conversion on the scaled image;
And a compressed image post-processing step of generating the image to be compressed by performing color interpolation and color conversion on the pre-processed image. In the camera device,
A camera for acquiring an image,
And a compression ratio determining unit for setting a certain area in the image obtained from the camera as a window for measuring the complexity of the image, filtering the pixels in the window, and determining the compression ratio adjustment value according to the image complexity by extracting the auto- An image processing unit for compressing the line image obtained from the camera according to the display image and the compression ratio adjustment value and outputting the compressed image as a compressed image and determining the complexity using the outline data of the image obtained in the process of extracting the auto focus filter value, Wow,
An application processing unit for buffering the display image and the compressed image output from the image processing unit on a frame basis and storing the compressed image in the buffered frame unit upon a capture request,
A display unit for displaying a display image in frame units output from the application processing unit;
And a storage unit for storing a compressed image in units of frames output from the application processing unit,
Wherein the compression ratio determination unit
And a table storing a plurality of factors for determining a compression ratio adjustment value of an image obtained from the camera, wherein the comparison unit compares the extracted auto-focus filter value with a preset reference value, and calculates a factor corresponding to the image complexity Is identified in the table. The image processing apparatus according to claim 11, wherein the image processing unit
A processing unit for processing an image obtained from the camera in units of lines to generate a display image;
A still image codec for compressing an image in a line unit output from the image processing unit according to the compression rate adjustment value and outputting a compressed image;
And a multiplexing unit for multiplexing the display image and the compressed image in the line unit and transmitting the multiplexed image to the application processing unit. 13. The apparatus of claim 12, wherein the compression ratio determination unit
A filter for filtering luminance data of an image output from the camera to generate an auto-focus filter value;
An adder for adding the auto-focus filter value,
And a determiner for analyzing the added filter value to determine a factor for adjusting a compression ratio according to image complexity. 14. The apparatus of claim 13, wherein the determination unit comprises a table, and determines the factor by comparing and analyzing the added filter value with the table.

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